3ds SD backup/install V2

#!/bin/bash
# attempt at a script to backup 3ds SD that can also install on new one
# V2 ! Now catches to block you from writing/reading on mounted devices! No more overwriting /dev/sda
# by imanoob (on irc)/LiquidFenrir (literally everywhere else)
# I can not be held responsible for whatever happens to your data when using this script!

PATHTOBACKUPS="/root/sdbackups/"

echo "This script uses '~/sdbackups/' as the directory to store the backups of the SD, as an .iso file named with a timestamp."
echo "WANRNING: The generated .iso will be the size of the entire SD. Make sure you have enough free space!"
echo "What do you want to do? 'backup' or 'install' ?"
while read action
do
    if [ "$action" == "backup" ] || [ "$action" == "install" ]; then
    break
    else
    echo "This is not a right input. Please enter 'backup' or 'install' !"
    fi
done
temp=$(df | tr "" "\n")
devices=()
for x in $temp
do
    if [[ "$x" =~ .*dev/*. ]]; then
    devices+=("$x")
    fi
done
echo "Use 'fdisk -l' to know connected drives and 'df' to know mounted drives. Do not use partitions."
echo "ex: use /dev/sdb instead of /dev/sdb1"
echo "ex: use /dev/mmcblk0 instead of /dev/mmcblk0p1"
echo "What is the location of the SD ?"
while read name
do
    state="good"
    if [ -e "$name" ]; then
    for x in ${devices[@]}
    do
        if [[ "$x" =~ "$name" ]]; then
        echo "This device is mounted! Please unmount it or use an other one."
        state="error"
        break
        fi
    done
    else
    echo "This device does not exist. Please use an other one."
    state="error"
    fi
    if [ "$state" == "error" ]; then
    echo "What is the location of the SD?"
    else
    break
    fi
done
echo "Press any key to start the $action. Press Ctrl+C to cancel."
read
if [ "$action" == "backup" ]; then
    DATE=$(date +%Y-%m-%d-%H%M)
    fullpath="$PATHTOBACKUPS$DATE.iso"
    echo "Writing data from '$name' to '$fullpath'. Please wait until completion. Closure may result in corruption of drives."
    touch "$fullpath"
    dd if="$name" of="$fullpath" bs=2k
    echo "Done!"
elif [ "$action" == "install" ]; then
    echo "Which backup do you want to use? (template: YYYY-MM-DD-HHmm do not add the .iso at the end, it will do it automatically.)"
    read backup
    fullpath="$PATHTOBACKUPS$backup.iso"
    echo "Writing data from '$fullpath' to '$name'. Please wait until completion. Closure may result in corruption of drives."
    dd if="$fullpath" of="$name" bs=2k
    echo "Done!"
else
    echo "An error occured! Please try again."
fi